Sand-blast machine.



PATENTED MAY 22, 190.6.

G. A. P. Hgss. SAND BLAST MACHINE.

APPLIGATION FILED FEB. 10. 1904.

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SAND BLAST MACHINE.

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j ql'IARl-JES AUGUSTUS PLTO HESS, 0F PARIS, FRANCE. v i SAND-BLAST MACHINE. y

No. semis.

Patented May 22, 1906.

To all whom it may concern;

Be it. known that I, CHARLES AneUs'rUs ILAro HEss, a citizen of the French Republic, residing at Avenue de lOpra, Paris, France, have ful Improvements in Sand-Blast Machines, of which the following is a specification. `This invention has for its objects improvements in sand-blast machines. j

In certain machines, as is well known, one and the same current of compressed air sucks at the same time projects it aglainst the surfacesto be scraped, or cleaned. T ere is thus .produced within the projector an agitation o r eddy due to the fact that the operations of suction and projection of the Y operated on."

sand are simultaneous and-not distinct and successive. By reason of this the energy of projection does not correspond with the pressure'of the compressedair at the generator.l In order ,to obviate this defect, a device is employed which permits` of se arating` the suc# tion and 'the projection--t at is to say, of first of all effecting the suction and then the projection of the sand upon the surface to be This process, therefore, permits of imparting to the jet an excess'pressure which compensates for the loss of charge which may have taken place during the pasd sage through the conduits. In certain machinesthe sand-box arranged atiadistance is connected with the rojector by means of a' `conduit serving for t e trans ort of the sand' ,j which is displaced therein un er the influence mencement of this latter and obstruct' it.

of the suction exerted by the compressed air acting in the pro'ector. The sand on leaving the sand-box falls into sents a tendency to accumulate at the corlnn other words, the flow of sand into this conduit is neither regular nor uniform. This is easily explained. The sand in the conduit constitutes a kind of sandy veinat the extremity of which (in the projector) a suction effect vonly is produced. In order to assure its flow it l is necessary to act upon its other extremityb n this manner the vein of sand 1s forcing. p

on at its two extremities by two acted u forces w this object there are formed at the commencement of the sand-conduit at'the place at which it leaves the hopper apertures communicatin with the open air. It will-be understood t at the atmospheric air in entering .through these apertures under' the in duence of the suction of the compressed air invented certain new and use that the compressed air Hsection throu h the funnel 2.

'vation and in this conduit and pre-V iich actin the same direction.,` Withl acts upon the vein of sand in the conditions above mentioned.

The sand issues from the conveyer-conduit. and enters the projector where in a mixingchamber it mixes with the com ressed air. In view of the fact that the sand orms a kind of vein the section of which is approximately that" of 4the conveyer-conduit it may happen isnot able to attack the sand throughout the entire thickness of the vein and does not come into contact with all the sandy particles. In other words, coli lections of sand may arise which will block the projection ajutage, and thus decrease the efiiciency. In order to obviate thisl defect andprevent the formation of these accumulations of. sand, the plan is adopted of splitting up the compressed air entering the mix,r ing-chamber into several parts, and consequentlyalso subdividing the vein of sand into as many parts. t of obtaining an important pract1cal result by imparting to the 'projection jet a form Whic is either convergent or divergent, which is of im ortance in certain applications.

n the accompanying rawings, Figure 1 is a longitudinal section of showingit app gitudinalsections -ofvarious forms of the im# the improvement,

lied. Figs. 2, 3, and 4 are 1on- This sectioning also permits provement. Fig. 5 is a longitudinal vertical Fig. 6 is a side elevation of t e same. Fig. 7 is aplan view ofthe same. Fig. 8 shows the register in eleplan. Fig. Qshow's the funnel 2 on -a 'smaller scale arranged upon the sandbox, which is mounted upon three feet. Figs..

10,11 and 12 representlongitudinal and horii `zonta sections through the device for splitting up the vein of sand in order toprevent the formation of accumulations in the mixingy chamber of the projector.

In Eig. 1, Combined with Eig. 9, the com;

pressed air enters through a., passes throughV the valve b, operated by a hand-lever, issues through the `a1r ajutage c, where it sucks the IOO sand coming from sand-box 1 throu h the 'i pipe d. The mixture of air andsan takes place in the mixing-chambery,

gigi, each provide with tWo'feed-pipesk, .3. l rand it is pro- `jected by the projection ajutage e. At this as in Fig. 1, by an I divide this pipe into In Fig. 4 the sand enters throu h the pipe '1, on the axis of the projector. t is sucked by the crown The crown 7c imparts the eX- cess pressure'.

The forcing device is represented in Figs. 5, 6, 7, and 8. The sand is contained in the hopper 1, Fig. 9, terminating in the funnel 2, in the bottom of which is formed a vertical passage .3, opening into a horizontal passage 4. The walls of the vertical passage 3 areformed with an aperture for the passage ofa register 6, Fig. 8, provided with an aperture, and with another aperture 7, communicating with the open air and situated a little above the place at which the passages 3 and 4 join. The drawing, Fig. 5, shows upon' the right and upon the left hand, respectively, two similar systems of passages 3 3, separated by a partition 5. This arrangement permits of feeding two rojectors with one and the same funnel 2.

vT e operation of the forcing device is as follows: The register 6 being arranged in position for permitting of the flow of the desired quantity of sand, the air issuing from the ajutage c, Fig. 1 produces a suction effect upon the sand which falls from the hopper 1 into the pipe 4 and also upon the Aatmospheric air which enters the pipe 4, Fig. 5, in passing through the hole 7. This atmos heric air thus forces the vein of sand, emuls' cumulated sand, divides it and forces it into the conduit 4 at the same time that this vein of sand undergoes a suction effect at its other extremity.

The sectioning device is represented in Figs. 10, 11, and 12. The mixing-chamber f2, Fig. 10, is divided into two com artments 8 and 9, Fig. 11, by a longitudina partition 10, which enters the pipe d, through which the sand is supplied in such a manner as to two equal portions for a portion of its length. The compressed-air ajutage c2, Fig. 10, is divided into two aju- .tages 11 and 12, Fig. 11, each of which supphes the chambers 8 and 9. The projection ajutage e2 is divided into two ajutages 14 and` 15 by a longitudinal partition 13, which forms a rolongation of the partition 10.

vI t wi be seen that the compressed air which reaches the ajutage cin a single vein is .divided b the ajutages 11 and 12 into two veins, eac of which sucks the sand from the conduit d, .the sandy vein in which is therefore divided into two veins also. The pro- 'ection takes place in the form of two veins, which umte outside the projector,fol1owmg a divergent jet.

es the ac- Obviously a multi le sectioning may be effected instead of a ouble sectioning only.

In order to obtain a convergent jet,Fig. 12, a portion of the partition dividing the ajutage'e3 is omitted and only a portion of the artition 16 is retained. The two projection ets 14 and 15 unite within the ajutage e3, which they leave in the form of a convergent jet.

Havin certaine and in what manner the same is to be performed, what I claim is-- 1. In a sand-blastin machine, a mixingchamber divided by a ongitudinal partition into two compartments, a projecting nozzle secured to'the chamber and provided with a partition in alinement with the partition of the chamber, and means for forcing air and and into the compartments of said cham- 2. In a sand-blasting machine, a mixingchamber having a longitudinal partition, a nozzle secured to the chamber and having a partition in alinement with the partition of the chamber, said partition having a wedgeshaped forward end terminating short of the end of the nozzle, and means for forcing air and sand into the compartments of the said chamber.

3. In a sand-blasting machine, a mixingchamber, having an air-inlet in alinement therewith and a sand-inlet atan angle thereto and provided with a longitudinal partition extending now particularly described and asfrom the air-inlet end of the chamber and into the sand-inlet, a nozzle provided with a partition .in alinement with the partition of the chamber, and means for forcing air and sand into the said chamber.

4. 'In a sand-blasting machine, -a mixingchamber havin a sand-conduit entering the same at an ang e, and provided with a longitudinal partition extending into the sandconduit, an air-nozzle secured to one end of the chamber and provided with two assages, a nozzle secured to the other end of t e chamber and rovided with a partition in alinement wit the partition of the chamber, and means connected with the nozzle whereby air will be forced into said chamber.

In witness whereof I have hereunto set my hand in presence of two witnesses.

CHARLES AUGUSTUS ritiro miss.

' Witnesses:-

MARIN CABORNDETTE, HANsoN C. Coxn.

the nature of my said invention 

